diff --git a/README.md b/README.md
index 80c633c..f2ce791 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ Commands can return one of three types:
 - { error: string }
 - { html: string }
 
+They can also `throw` to display an error.
+
 ## Fonts
 
 Use this to examine what's inside the C64 .woff2 font file in public/vendor: